Great info thanks again, I'll be doing the parallel gap from now on.
On Fri, Jul 27, 2018, 4:00 PM David Speck <Dave@xxxxxxxxxxxxxxxx> wrote:
> Matthew,
>
> If you put the spark gap across the transformer, as seems to be the
> current best practice, then the gap essentially shorts out the
> transformer during the time that the gap is firing. I once read that,
> to a close approximation, the impedance of nearly any electrical arc is
> about 600 ohms.
>
> That is not a problem, because NSTs are current limited, and will
> happily drive their rated output current into a short circuit all day
> without damage.
>
> A ballasted potential transformer, like a pole transformer, can also
> drive a short circuit for a reasonable period of time. The spark gap
> normally fires for only a small percentage of the entire 60 Hz waveform.
>
> Putting the gap across the transformer is considered a good idea because
> it reduces the induction of big voltage spikes in the NST or PT
> windings, which would be expected to happen if the gap is NOT across the
> transformer inputs.
>
> Good quenching of the spark gap is important, though to prevent the
> development of power arcs, which would prevent the transformer from
> charging the TC tank circuit.
>
> Dave
>
>
>
> On 7/26/2018 6:11 PM, Matthew Sweeney wrote:
> > That makes sense, I always assume the spark gap In series.
> >
> > So when the transformer 'shorts' across the gap what happens to current
> > draw?
> >
> > That might be a trivial eletrics lesson but I find myself kind of lacking
> > when it comes to NSTs.
> >
> > Thanks!
>
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